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COLOR 
COMPUTER 



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LIMITED WARRANTY 



RAOIO SHACK Software is licensed on an "AS IS" basis, without warranty. The original CUSTOMER'S exclusive remedy, in 
the event ot a Software manufacturing defect, is its repair or replacement within thirty (30) calendar days ot the date ol the 
Radio Shack sales document received upon license ol the Software. The detective Software shall be returned to a Radio Shack 
Computer Center, a Radio Shack retail store, participating Radio Shack franchisee or Radio Shack dealer along with the sales 
document 

Except as provided herein. RADIO SHACK MAKES NO WARRANTIES. INCLUDING WARRANTIES OF MERCHANTABILITY 
OR FITNESS FOR A PARTICULAR PURPOSE. 

Some stales do not allow limitations on how long an implied warranty lasts, so the above limitation(s) may not apply to 
CUSTOMER. 

RADIO SHACK SHALL HAVE NO LIABILITY OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR ENTITY 
WITH RESPECT TO ANY LIABILITY, LOSS OR DAMAGE CAUSED OR ALLEGED TO BE CAUSED DIRECTLY OR INDIRECTLY BY 
' SOFTWARE" LICENSED OR FURNISHED BY RADIO SHACK. INCLUDING, BUT NOT LIMITED TO. ANY INTERRUPTION OF 
SERVICE. LOSS OF BUSINESS OR ANTICIPATORY PROFITS OR INDIRECT, SPECIAL, OR CONSEQUENTIAL DAMAGES. 

Some states do not allow the limitation or exclusion ot incidental or consequential damages, so the above hmitation(s) or 
exclusion(s) may not apply to CUSTOMER. 

RADIO SHACK SOFTWARE LICENSE 

RAOIO SHACK grants to CUSTOMER a non-exclusive, paid-up license to use the RADIO SHACK Software on one computer, 
sublet to the following provisions: 

A. Except as otherwise provided in this Software License, applicable copyright laws shall apply to the Software. 

B. Title to the medium on which the Software is recorded (cassette and.or diskette) or stored (ROM) is transferred to 
CUSTOMER, but not title to the Software. 

C. CUSTOMER shall not use, make, manufacture, or reproduce copies ol Software except for use on one computer and as is 
specifically provided in this Software License Cuslomer is expressly prohibited from disassembling the Software 

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copies are required in the operation of one computer with the Software, but only to the extent the Software allows a backup 
copy to be made. 

E. All copyright notices shall be retained on all copies of the Software. 

The warranties granted herein give the original CUSTOMER specific legal rights, and the original CUSTOMER may have 
other rights which vary from state to state. 



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Doubleback™ 



Radio /haeK 

A DIVISION OF TANDY CORPORATION 
FORT WORTH, TEXAS 76102 



uouoieDacK urogram: 

©1982 Dale Lear. 

Licensed to Tandy Corporation 

All Rights Reserved. 

This applications software for the TRS-80 Color 
microcomputer is retained in a read-only memory (ROM) 
format. All portions of this software, whether in the 
ROM format or other source code form format, and the 
ROM circuitry, are copyrighted and are the proprietary 
and trade secret information of Tandy Corporation 
and/or its licensor. Use, reproduction or publication of 
any portion of this material without the prior written 
authorization by Tandy Corporation is strictly pro- 
hibited. The license for using this software is printed on 
the inside front cover of this manual. 

Doubleback Program Manual: 

(■1982 Tandy Corporation 

All Rights Reserved. 

Reproduction or use, without express written permis- 
sion from Tandy Corporation, of any portion of this 
manual is prohibited. While reasonable efforts have 
been taken in the preparation of this manual to assure 
its accuracy, Tandy Corporation assumes no liability 
resulting from any errors or omissions in this manual, or 
from the use of the information contained herein. 

10 9 8765432 1 



Introduction 



Doubleback is a game of skill and coordination for one or two players using 
joysticks. The object is to collect as many points as possible by tracing a 
path around the moving and stationary objects that materialize around you. 



System Requirements 

A TRS-80 Color Computer with at least 4K RAM 

A standard television 

Joysticks 



Loading Instructions 

1 . Before inserting or removing the Doubleback Program Pak™, make sure 
the computer is OFF. Failure to do so could result in damage to the 
Program Pak. 

2 . Connect the Color Computer to the television set and move the antenna 
switchbox control to Computer (or Game). See your TRS-80 Color Com- 
puter Operation Manual for further details regarding connections. 

3. Plug the joystick controllers into the jacks located on the back of the 
computer. 

4 . Insert the Doubleback Program Pak, label side up, into the slot located on 
the right side of the computer. Press firmly until it securely engages, but 
do not force it. 

5 . Turn on the television and tune it to channel 3 or 4 (whichever is least ac- 
tive in your area). 

6 . Turn on the Color Computer. You may have to adjust the focus on the 
television or press the Reset button (located on the back right side of the 
computer) to obtain a clear picture. The word Doubleback should appear 
blue on the screen. If you do not have the blue screen color, press the 
Reset button repeatedly until it appears this way. 



Playing the Game 

First, select either one or two players by moving the lever on the right 
joystick. Press the button on the joystick, and you're ready to start the 
game. 

You are on a hunt for objects which mysteriously appear on the screen. As 
you patrol the area, use your joystick to control the path of your progress. 
To score points, you must circle an object, forming a complete loop with 
your trail. If you are skillful enough to catch two or more objects in one loop, 
you get extra points. You have to be fast, though, because your trail fades 
away quickly. 

You have three turns in which to surround as many objects as possible. The 
red bar at the top of the screen shows which turn it is now. 

Be alert when you're surrounding an object— if you run into it, your play for 
that turn is up. You'll find that some unpredictable things, like yo-yos anc 
spiders, don't like to stay put. 

If you are successful in your efforts, you may encounter an addec 
danger — skulls. They can pop up out of nowhere to thwart your best efforts. 
(Warning: After ten skulls, beware of the unexpected!) 

To end a game of Doubleback in the middle and start a new one, press the 
1 BREAK ) key. 



SCORE CHART 



apple 

cherries 

magnet 

skate 

yo-yo 

pear 

spider 

skull 



70 points 
100 points 
150 points 
200 points 
250 points 

(possible only after 2560 points) 
300 points 

(possible only after 5120 points) 
500 points 
(possible only after 7680 points) 

points 
(possible only after 10,240 points) 



(Note: Skull will not disappear until your turn is up.; 



When you circle more than one object, the points scored equal the sum of 
the points for the objects times the number of objects circled (not including 
skulls). 



RADIO SHACK, A DIVISION OF TANDY CORPORATION 



U.S.A.: FORT WORTH, TEXAS 76102 
CANADA: BARRIE, ONTARIO I4M 4W5 



TANDY CORPORATION 



AUSTRALIA 



280-316 VICTORIA ROAD PARC INDUSTRIE!. DE NANINNE BILSTON ROAD WEDNESBURY 

RYDALMERE. N.S.W. 2116 5140 NANINNE WEST MIDLANDS WS10 7JN 



Printed in U.S.A.